| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.41/5 | 3.70/5 |
| Vol 3-4 | 2.40/5 | 3.65/5 |
| Vol 5-6 | 2.58/5 | 3.71/5 |
| Vol 7-8 | 2.49/5 | 3.71/5 |
| Vol 9-10 | 2.53/5 | 3.58/5 |
| Vol 11-12 | 2.34/5 | 3.61/5 |
| Vol 13-14 | 2.47/5 | 3.64/5 |
| Vol 15-16 | 2.36/5 | 3.67/5 |
| Vol 17-18 | 2.52/5 | 3.74/5 |
| Vol 19-20 | 2.53/5 | 3.73/5 |
| Vol 21-22 | 2.57/5 | 3.81/5 |
| Vol 23-24 | 2.58/5 | 3.81/5 |
| Vol 25-26 | 2.54/5 | 3.77/5 |
| Vol 27-28 | 2.92/5 | 4.06/5 |
| Vol 29-30 | 2.60/5 | 3.74/5 |
| Vol 31-32 | 2.58/5 | 3.87/5 |
| Vol 33-34 | 2.52/5 | 3.68/5 |
| Vol 35-36 | 2.34/5 | 3.64/5 |
| Overall | 2.52/5 | 3.73/5 |